Convertible tonneau cover



FIG. 1 is a side view of the convertible tonneau cover in a fully extended form;

FIG. 2 is a rear perspective view of the convertible tonneau cover in a fully contracted form;

FIG. 3 is a rear perspective view of the convertible tonneau cover in a partially extended form; and

FIG. 4 is a rear perspective view of the convertible tonneau cover in a fully extended form with a back panel partially set; and,

FIG. 5 is a rear perspective view of the convertible tonneau cover in a fully extended form with a back panel fully set.

The broken line showing is for the purpose of showing environmental structure and forms no part of the claimed design. 

CLAIM The ornamental design for a convertible tonneau cover, as shown and described. 